Dino-killing asteroid could have thrust Earth into 2 years of darknesshttps://www.eurekalert.org/pub_releases/2017-08/ncfa-dac081617.php
“Tremendous amounts of soot, lofted into the air from global wildfires following a massive asteroid strike 66 million years ago, would have plunged Earth into darkness for nearly two years, new research finds. This would have shut down photosynthesis, drastically cooled the planet, and contributed to the mass extinction that marked the end of the age of dinosaurs.”

Massive Volcanic Eruptions Triggered the Dinosaur Agehttps://www.seeker.com/earth/animals/massive-volcanic-eruptions-triggered-the-dinosaur-age
“Intense volcanic eruptions, along with a devastating meteor strike, likely contributed to the extinction of non-avian dinosaurs around 66.5 million years ago. Now new research shows that volcanic eruptions at the end of the Triassic period (252–201 million years ago) triggered the Dinosaur Age, meaning these animals were bookended by some of Earth’s most extreme and fiery conditions.”
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